Image quality processing method and display device using the same

Abstract

This embodiment herein relates to an image quality processing method and a display device using the same which decrease a hardware processing load of the display device and improve both a contrast ratio and sharpness of edges in an image.

What is claimed is: 
     
       1. An image quality processing method comprising:
 receiving luminance data of pixels of an image, each pixel disposed at a corresponding coordinate; 
 generating high luminance data at a coordinate (j,k) by multiplying the luminance data at the coordinate (j,k) by a first value; 
 generating low luminance data at the coordinate (j,k) by multiplying the luminance data at the coordinate (j,k) by a second value; 
 converting the luminance data, the high luminance data, and the low luminance data at the coordinate (j,k), into blurred luminance data, blurred high luminance data, and blurred low luminance data at the coordinate (j,k), respectively, by blur processing operations with a mask; 
 generating conversion luminance data at the coordinate (j,k) based on a first difference between the blurred high luminance data at the coordinate (j,k) and the blurred luminance data at the coordinate (j,k), and a second difference between the blurred luminance data at the coordinate (j,k) and the blurred low luminance data at the coordinate (j,k); and 
 outputting the generated conversion luminance data to a display panel, 
 wherein generating the conversion luminance data comprises:
 generating the conversion luminance data at the coordinate (j,k) by using an equation 
 
 
       
         
           
             
               
                 
                   Y 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   4 
                   ⁢ 
                   
                     ( 
                     
                       j 
                       , 
                       k 
                     
                     ) 
                   
                 
                 = 
                 
                   MaxData 
                   × 
                   
                     
                       D 
                       ⁢ 
                       
                           
                       
                       ⁢ 
                       2 
                     
                     
                       
                         D 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         1 
                       
                       + 
                       
                         D 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         2 
                       
                     
                   
                 
               
               , 
             
           
         
         
           where Y 4 (j,k) is the conversion luminance data at the coordinate (j,k), D 1  is the first difference between the blurred high luminance data at the coordinate (j,k) and the blurred luminance data at the coordinate (j,k), D 2  is the second difference between the blurred luminance data at the coordinate (j,k) and the blurred low luminance data at the coordinate (j,k), and MaxData is a maximum value of the conversion luminance data. 
         
       
     
     
       2. The image quality processing method of  claim 1 , wherein the first value is greater than 1 and less than 2, and the second value is greater than 0 and less than 1. 
     
     
       3. The image quality processing method of  claim 1 , wherein converting the luminance data into the blurred luminance data comprises:
 multiplying the luminance data of the pixels on a p×q mask by weight values of the p×q mask, wherein p and q are natural numbers greater than 2; 
 calculating an average of the luminance data of the pixels on the p×q mask multiplied by the weight values; 
 replacing the blurred luminance data of a pixel of a central position of the p×q mask with the average, the pixel of the central position of the p×q mask corresponding to the coordinate (j,k); and 
 shifting the p×q mask on a basis of the central position of the p×q mask, 
 wherein the weight values are set in accordance with a position of the p×q mask. 
 
     
     
       4. The image quality processing method of claim further comprising:
 generating the luminance data and chrominance data from input digital video data; and 
 generating conversion digital video data from the conversion luminance data and the chrominance data. 
 
     
     
       5. A display device comprising:
 a display panel including data lines, gate lines, and a plurality of pixels; 
 an image quality processor configured to convert digital video data into conversion digital video data; 
 a data driving circuit configured to convert conversion digital video data into analog data voltages, and supply the analog data voltages to the data lines; and 
 a gate driving circuit configured to sequentially supply a gate signal to the gate lines, 
 wherein the image quality processor comprises:
 a luminance data generator configured to:
 receive luminance data of pixels of an image, each pixel disposed at a corresponding coordinate, 
 generate high luminance data at a coordinate (j,k) by multiplying the luminance data at the coordinate (j,k) by a first value, and 
 generate low luminance data at the coordinate (j,k) by multiplying the luminance data at the coordinate (j,k) by a second value, 
 
 a mask operator configured to convert the luminance data, the high luminance data, and the low luminance data at the coordinate (j,k), into blurred luminance data, blurred high luminance data, and blurred low luminance data at the coordinate (j,k), respectively, by blur processing operations with a mask, and 
 a conversion luminance data generator configured to generate conversion luminance data at the coordinate (j,k) based on a first difference between the blurred high luminance data at the coordinate (j,k) and the blurred luminance data at the coordinate (j,k), and a second difference between the blurred luminance data at the coordinate (j,k) and the blurred low luminance data at the coordinate (j,k), 
 wherein the conversion luminance data generator generates the conversion luminance data at the coordinate (j,k) by using an equation 
 
 
       
         
           
             
               
                 
                   Y 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   4 
                   ⁢ 
                   
                     ( 
                     
                       j 
                       , 
                       k 
                     
                     ) 
                   
                 
                 = 
                 
                   MaxData 
                   × 
                   
                     
                       D 
                       ⁢ 
                       
                           
                       
                       ⁢ 
                       2 
                     
                     
                       
                         D 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         1 
                       
                       + 
                       
                         D 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         2 
                       
                     
                   
                 
               
               , 
             
           
         
         
           
             where Y 4 (j,k) is the conversion luminance data at the coordinate (j,k), D 1  is the first difference between the blurred high luminance data at the coordinate (j,k) and the blurred luminance data at the coordinate (j,k), D 2  is the second difference between the blurred luminance data at the coordinate (j,k) and the blurred low luminance data at the coordinate (j,k), and MaxData is a maximum value of the conversion luminance data. 
           
         
       
     
     
       6. The display device of  claim 5 , wherein the first value is greater than 1 and less than 2, and the second value is greater than 0 and less than 1. 
     
     
       7. The display device of  claim 5 , wherein the mask operator is configured to:
 multiply the luminance data of the pixels on a p×q mask by weight values of the p×q mask, wherein p and q are natural numbers greater than 2; 
 calculate an average of the luminance data of the pixels on the p×q mask multiplied by the weight values; 
 replace the blurred luminance data of a pixel of a central position of the p×q mask with the average, the pixel of the central position of the p×q mask corresponding to the coordinate (j,k); and 
 shift the p×q mask on a basis of the central position of the p×q mask, 
 wherein the weight values are set in accordance with a position of the p×q mask. 
 
     
     
       8. The display device of  claim 5 , wherein the luminance data generator generates the luminance data and chrominance data from input digital video data. 
     
     
       9. The display device of  claim 5 , further comprising:
 a conversion digital video data generator configured to generate the conversion digital video data from the conversion luminance data and chrominance data.